Questions tagged [blockchain]

The blockchain is the journal of all confirmed Bitcoin transactions. It consists of a linked sequence of blocks and each block contains a list of transactions. For questions about the eponymous company or its products please use [blockchain.info]!

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Understanding how ordinals work with the Bitcoin blockchain. What is exactly stored on the blockchain?

Supposedly someone uploaded a Doom clone to the bitcoin blockchain: https://ordinals.com/content/521f8eccffa4c41a3a7728dd012ea5a4a02feed81f41159231251ecf1e5c79dai0 But I'm a bit confused on exactly ...
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1 answer
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Is bitcoin bonus and cloud mining real? [duplicate]

I received an email saying I have so much money from a cloud mining app that I set up using my phone and the app connected with my IP address.. I didn't really pay to much attention to the app so I ...
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How do I get the Primes from Primecoins blockchain? [closed]

Primecoin uses a novel technique to find new prime numbers, and its raw blocks can be found here: https://chainz.cryptoid.info/xpm/block.dws?5114841 And I'm trying to extract the prime numbers it has ...
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1 answer
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Follow-up to Segwit: Arbitrary data storage in witness?

In 2017 a question about Segwit: Arbitrary data storage in witness? asked whether people wanting to store more data in the blockchain than OP_RETURN allows could instead store data in the witness ...
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3 answers
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What is the use of longest chain consensus rule?

I want to know Couldnt a chain be hardcoded in the bitcoin rules itself? Only so and so chain can be used. During the early days of bitcoin, I know a small group of enthusiasts were miners. And they ...
0 votes
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388 views

Has anybody ever got email in their doc saying they have funds from BTC Bitcoin bonus giveaway [duplicate]

So I got an email from in my docs saying that I had to go to this page and I had all mining earnimgs everything that I hadn't withdrawed from a year ago on on a platform I let them use my IP to mine ...
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0 answers
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Google forms email [duplicate]

I got an email saying my account would be deleted soon and I earned a lot of Bitcoin I can't seem to figure out how to receive my money though It's from Bitcoin bonus A cloud mining platform is all I ...
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NameError at /register name 'privtopub' is not defined

from django.shortcuts import render, redirect from django.contrib.auth.models import User, auth from django.contrib import messages from .models import Details from bitcoin import * import random ...
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Error validating transaction: Error running script for input 0 referencing <vin-txid> at 0: Script was NOT

While broadcasting this multisig-segwit transaction on bitcoin testnet, I am getting this error Error validating transaction: Error running script for input 0 referencing ...
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1 answer
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Why criminals still use bitcoin mixers when there is other blockchains?

I came across the following article Allen Goldmann, A person is trying to hide $5 million in stolen Bitcoins from a Darknet marketplace, Forbes, November 28, 2022 where some criminal tried to ...
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1 vote
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How many digital signatures appear in a block?

I am wondering how many times ECDSA digital signature are used across transactions in one block. Let's take for example Block #735,273. It contains 405 transactions. My understanding is that each ...
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1 answer
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Withdrew Bitcoin from Binance to someone's wallet. They said they never received it [duplicate]

I sent 0.3061 BTC from Binance 4 days ago to a wallet but the recipient said they never got anything. The address is bc1qsx2w6u4vgwmadp964s66yu6nuu85cdg58a9kpf. Every blockchain site says the ...
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1 answer
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How is the Prev_block_id managed?

I found this schema. I wonder how organize the relationship with prev_block_id(prev_hash)? I think it would be like a below schema.(Here limited to id(hash)) CREATE TABLE block ( id VARCHAR(8) ...
1 vote
2 answers
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Analyse huge amount of blockchain data

I am trying to go over all transactions data from every block on the bitcoin blockchain from the previous 4 years. With almost 2k transaction per block, it will take a lot of queries per block. I have ...
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Optimal way to design BTC withdraw flow?

I am designing an exchange application that allows users to deposit and withdraw BTC. During the withdraw process, several failures could happen (e.g. transaction gets stuck, transaction gets dropped ...
1 vote
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How can I obtain relayed_by IP via Blockchain Data API?

I have tried to look for "relayed_by" IP address via the Blockchain Data API for a few transactions but it always returns "relayed_by":"0.0.0.0". For example, https://...
2 votes
3 answers
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How can I determine the block height on a certain day?

Is there an easy calculator to determine the block height on a certain day? i.e what was the block height on 14th October? This was asked by JoeNakamoto on Twitter. There is a related question on ...
0 votes
2 answers
87 views

Create a BTC account programmatically

Is that possible to create new BTC(or any other cryptocurrency) account through free api or kind of?
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2 answers
71 views

Blockchain's previous snapshot

Is there any way to download past btc transactions without running a full node? Searching about this, usually all the answers suggest to run a full node. I.e. I want a file that contains, say, all the ...
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1 vote
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latest UTXO databases received

There are many repositories that allow you to turn blockchain into UTXO. But I can't find where I could download ready-made UTXOs. I only find instructions on how to get such a database myself. ...
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How to check the amount of currency in the wallets unlimited and without downloading the entire database?

I need to know by address how many coins at the moment and how many transactions (whether there were any transactions on the wallet at all). At the moment the base weighs 400gb. 100% option is to ...
1 vote
1 answer
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Why is number of downloaded block files far fewer than current block height?

I'm attempting to download the entire blockchain and then run some analysis of wealth distribution at various points in time and in response to specific events. A website like blockchain.com's block ...
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1 answer
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How to Generate P2SH Address from XPUB Ledger

I'm trying to Generate unused receiving Addresses for a Segwit P2SH wallet in my Ledger. I tried https://pypi.org/project/bitcoinlib/ but without success, the addresses weren't right. This is from my ...
-1 votes
2 answers
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how can I launch my blockchain through bitcoin-core?

How can you run your blockchain, not through regtest, but a real one
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How can I use blockchain.info websocket to constantly check for payments inside express API then update database

I'm trying to constantly check for a bunch of address's to see if they have been paid or not in real-time using websockets. I made a little express API that pulls the wallet from the database and then ...
0 votes
1 answer
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Exploiting the use of signature?

I've just learned signatures and why they're used in blockchain. As I understand there is a key pair that consist of one public key and one private key: Private keys are used to sign a message(...
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1 answer
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How are newly generated key-pairs kept unique to a single cryptocurrency?

As an extension to this question and some quick searches on software crypto wallets - my understanding is that any newly generated key-pair is unique to a specific cryptocurrency. Assuming this is ...
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3 answers
117 views

Are all wallets always considered nodes?

Likely a duh question, but are all network participants (or wallet holders here) always considered nodes? Am I right to say that the answer might depend on what the wallet is capable of doing in terms ...
-1 votes
1 answer
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are the hubs on the internet the only hackable 'computer'?

Context here: I'm a newbie on internet&blockchain, but I read some article and they said on the internet, computers are connected through hub(s). So, It seems to me that there's no other 'users' ...
2 votes
3 answers
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Relation between PoW and integrity?

I'm pretty new to the Blockchain technology. In a video that I watched, the lecturer talked about Consensus Algorithms and said that they're used for maintaining the integrity of the blockchain.  Then ...
1 vote
1 answer
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Wrong hashes for blocks when parsing from blk

Hello I'm using a python script to actually retrieve information from a blk file and to read data. import datetime # Read block ! file = open("REDACTED\blocks\\blk00000.dat", 'rb') ...
1 vote
1 answer
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Why is Bitcoin core deleting my blk files while downloading blockchain?

I want to download the bitcoin blockchain to actually be able to parse it using the blk files, but as I'm seeing right now while installing, bitcoin core is deleting them and keeps downloading newer ...
-1 votes
1 answer
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Could you clarify the definition of bitcoin, that is "coin", which Nakamoto defined as "a chain of digital signatures"(details below)?

Say Alice buys 1 BTC and Bob 100 BTC. Nakamoto defined coin(BTC) as a "chain of digital signatures", so Alice bought 1 such chain, and Bob 100 chains. That makes no sense to me, so could you ...
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Double spending: Do miners generally adhere to the RBF-Flag (replace by fee) in on-chain transactions and the FSS-rule (First Seen Save)?

I've been reading some articles about 0-conf scams happening, where someone accepts bitcoin on-chain without waiting for even a single on-chain confirmation. In this blog post, it is described that ...
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2 votes
1 answer
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How can I take a "snapshot" of the bitcoin blockchain and analyze it?

What I want to do: Download the copy of bitcoin blockchain Select from it all those addresses that have bitcoins (> 0.05 BTC) and they have not been active for > 7 days Display statistics on ...
2 votes
1 answer
92 views

What prevents miners from removing transactions when validating a node? [duplicate]

Simple question: when a miners receives a block of transactions, he can't add fraudulent transactions because they need to be appropriately signed, but what prevents him from erasing a tx? If he ...
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0 answers
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BLOCKCHAIN CIRCULATOIN IF COIN NOT RECEIVE? [duplicate]

UK Company send some bitcoin in my wallet address but after 100 of confirmation bitcoin not showing in my Binance Account. So Depositer saying that recipient have to send half of actual value of ...
1 vote
1 answer
56 views

Restarting the bitcoin chain in a land far away, after a global total collapse disaster

So I've been thinking about this scenario, you are a survivor of a global disaster. Years later you find a running solar powered bitcoin node and want to restart the chain. You have a few running ...
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1 vote
0 answers
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BlockCypher API signature bitcoin transaction Error

I'm trying to make a bitcoin transaction using the BlockCypher API and I'm getting an error when I try to sign the transaction. This function creates an unsigned transaction: def buildTransaction(...
1 vote
0 answers
86 views

Error `settings.json file has no read or write access` - but permissions OK

I was downloading the whole Bitcoin blockchain and the download stopped and I got an error message that the settings.json file has no read or write access, but I checked the permissions of the file, ...
0 votes
2 answers
45 views

How is crypto Mining actually validating the block?

As far as I understand in crypto-mining you are trying to find the nonce such that the hash starts with some amount of zero's. I do not understand how this nonce is used to actually validate anything.
1 vote
0 answers
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bitcoin TransactionBuilder is not a constructor

I'm trying to send bitcoin with the bitcoinjs-lib library and I get the following error: TypeError: bitcoin.TransactionBuilder is not a constructor at sendmoney (/Users/....../bitcoin.js:53:18) at ...
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0 answers
99 views

Why my node1 can's sync from the other node through RPC command "addnode IP:port onetry"?

I'm using bitcoin core 22.0 to start two nodes in two different containers in the same VMware ubuntu18.04, with network mode using Host-Only(I will talk about the reason later). What my aim to do so ...
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Can Bitcoin Core Blockchain initial sync time in BitcoinQT be sped up?

Given the following platform hardware and internet data speed (provided below), what settings are recommended for fastest possible blockchain download and sync? This is the hardware I'm running: Note:...
-1 votes
3 answers
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How 2 chains co-exist together?

I am not able to understand, how 2 chains co-exist together, like these were the observations which are ambiguity for me: In one reading I have read, Only longest chain is valid and and rest chains ...
0 votes
2 answers
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Whats it called when two blocks are solved at the same time and create their own chain?

I'm trying to find more information on this topic but I can't remember what this is called in order to look up more information on it. Is there an easy way to see the "trusted" amount of ...
3 votes
2 answers
62 views

Why anonymity is important in blockchain, what are the core reasons?

I have searched a lot about this topic, but couldn't get a perfect answer. Why is anonymity is important in blockchain if the transactions are legit, What are the core reasons for importance of ...
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0 answers
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How do we know a new transaction is not corrupted/manipulated? [duplicate]

let's say I want to send a certain amount of bitcoin to a certain client, but my computer is connected to a public wifi, how do I make sure there is not a man in the middle altering the transaction ...
0 votes
3 answers
98 views

How does Bitcoin prevent double-spending without penalizing miners?

In the network nodes below as shown in picture: Let's say A is trying to double spend by sending bitcoins to B,C (A->B) and (A->C) and let's say A tried to relay (A->B) transaction to honest ...
1 vote
2 answers
142 views

Are transactions included in a block or is only the Merkle-root hash included in a block

Before broadcasting block into bitcoin blockchain, Does a Block transactions are included in a block or only the hash of them are included in a block. While I am surfing through net, I came across two ...

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